Actually, I was wrong about the prior one. https://patents.google.com/patent/US6411716 looks like it has a distributed CA function with multi-step, multi-fragment signatures. (This looks fascinating, and I'm going to study it over the weekend -- still in a lockdown, so no real Memorial Day party for me.)
-Kyle H On Sun, May 24, 2020, 14:59 Kyle Hamilton <aerow...@gmail.com> wrote: > From glancing at the abstract, https://patents.google.com/patent/US5799086 > looks like it might be the one? It also says that it is expired, > expiration having been anticipated on 2014-01-13. > > -Kyle H > > On Sun, May 24, 2020, 11:54 Salz, Rich <rs...@akamai.com> wrote: > >> >> - In any case, I am unaware of any existing system which meets your >> requirement 3. Admittedly, I haven't specifically searched for such. >> >> >> >> CertCo (now defunct, don’t know who has the intellectual property) had a >> patent that did ALL of the things. RSA keygen, split the key, each key >> signs the data, looks like an RSA signature, then when enough have been >> done, combine them and it matches the original pre-split public key. That, >> and the followon patents, are cool. Don’t know if they’re expired or not. >> >> >> >> To answer the main question: OpenSSL doesn’t do anything remotely in this >> area. The closest is multi-prime RSA. >> >